1 files changed, 13 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/as_underscore.rs b/src/tools/clippy/tests/ui/as_underscore.rs
new file mode 100644
index 000000000..97785ed08
--- /dev/null
+++ b/src/tools/clippy/tests/ui/as_underscore.rs
@@ -0,0 +1,13 @@
+// run-rustfix
+
+#![warn(clippy::as_underscore)]
+
+fn foo(_n: usize) {}
+
+fn main() {
+    let n: u16 = 256;
+    foo(n as _);
+
+    let n = 0_u128;
+    let _n: u8 = n as _;
+}